condition mean min max ZT0-3 66.94999999999999 66.94999999999999 66.94999999999999 ZT4-7 48.3 48.3 48.3 ZT8-11 69.7 69.7 69.7 ZT12-15 53.9 53.9 53.9 ZT16-19 49.7 49.7 49.7 ZT20-23 66.9 66.9 66.9